Write a horror story set in an isolated lighthouse during a violent storm. The lighthouse keeper discovers that the beam of the lighthouse doesn't just cut through the darkness; it illuminates invisible, eldritch creatures swimming in the sky above the ocean. Every time the beam rotates, it shines directly on them, and they are getting closer to the glass. The keeper must decide whether to turn off the light and be swallowed by the dark storm, or keep it on and guide the monsters straight to the door.